i) Convex mirror - Driving mirror
- Supermarket
ii) Parabolic mirror - solar heater reflector
- Reflector
- Torch reflector
(iii) Concave mirrors-Shaving mirrors
- Used by dentists
johnmulu answered the question on February 9, 2017 at 14:42
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A lady holds a large concave of focal length 1 m, 80 cm from her face. State two characteristics of her image in the mirror
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A lady holds a large concave of focal length 1 m, 80 cm from her face. State two characteristics of her image in the mirror
Date posted:
February 7, 2017
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Answers (1)
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Date posted:
February 7, 2017
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Date posted:
February 7, 2017
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(Solved)
A uniform metal strip is 3.0 cm wide, 0.6 cm thick and d 100 cm long. The density of the metal is 2.7 g/cm3. Determine the weight of the strip
Date posted:
February 7, 2017
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Answers (1)
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Date posted:
February 7, 2017
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Answers (1)
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Date posted:
February 7, 2017
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Date posted:
February 7, 2017
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Answers (1)
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Date posted:
February 7, 2017
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Answers (1)
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State factors that affects the turning effect of a force on a body.
Date posted:
February 7, 2017
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Answers (1)
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The moment of the weight of vertical door does not significantly affect the moment of the force required to open the door
(Solved)
The moment of the weight of vertical door does not significantly affect the moment of the force required to open the door. Give a reason for this.
Date posted:
February 7, 2017
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Answers (1)
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When a drop of organic acid of known volume is dropped on the surface of water in a large trough, it spreads out to form a large circular patch
(Solved)
When a drop of organic acid of known volume is dropped on the surface of water in a large trough, it spreads out to form a large circular patch. State one assumption made when the size of the molecule of the acid is estimated by determining the area of the patch
Date posted:
February 7, 2017
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Answers (1)
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Derive an expression for obtaining the diameter, d of a molecule of oil
(Solved)
An oil drop of volume V m3 introduced on the surface of water spreads to form patch whose area is Am2. Derive an expression for obtaining the diameter, d of a molecule of oil.
Date posted:
February 7, 2017
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Answers (1)
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(Solved)
State two environmental hazards that may occur when oil spills over a large surface area of the sea.
Date posted:
February 7, 2017
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Answers (1)
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(Solved)
When a drop of oleic acid of known volume is dropped on the surface of water in a large trough, it spreads out to form a large circular patch. State one assumption made when the size of the molecule of oleic acid is estimated by determining the area of the patch.
Date posted:
February 7, 2017
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Answers (1)
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In an experiment to estimate the diameter of an oil molecule, an oil drop of diameter 0.05 cm spreads over a circular patch whose diameter is 20 cm
(Solved)
In an experiment to estimate the diameter of an oil molecule, an oil drop of diameter 0.05 cm spreads over a circular patch whose diameter is 20 cm.
Determine i) the volume of the oil drop
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iii) The diameter of the oil molecule
Date posted:
February 7, 2017
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Answers (1)
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State the assumption made when calculating the size of a molecule in the oil drop experiment
(Solved)
State the assumption made when calculating the size of a molecule in the oil drop experiment
Date posted:
February 7, 2017
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Answers (1)
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Name the instrument that would be most suitable for measuring the thickness of one sheet of this question paper.
(Solved)
Name the instrument that would be most suitable for measuring the thickness of one sheet of this question paper.
Date posted:
February 7, 2017
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Answers (1)
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State the reason why the magnetic field strength of a magnet is greatest at the poles
(Solved)
State the reason why the magnetic field strength of a magnet is greatest at the poles.
Date posted:
February 7, 2017
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Answers (1)
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One method of producing a weak magnet is to hold a steel rod in the North South direction and the hammer is continuously for some time
(Solved)
One method of producing a weak magnet is to hold a steel rod in the North South direction and the hammer is continuously for some time. Using the domain theory of magnetism explain how this method works.
Date posted:
February 7, 2017
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Answers (1)
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An un-magnetized steel rod is clamped facing North-South direction and then hammered repeatedly for some time. When tested, it is found to be magnetized
(Solved)
An un-magnetized steel rod is clamped facing North-South direction and then hammered repeatedly for some time. When tested, it is found to be magnetized. Explain this observation
Date posted:
February 7, 2017
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Answers (1)